高铁隧道新型自行式仰拱栈桥施工技术

Construction technology of a new self-propelled inverted arch trestle in high-speed railway tunnel

为解决传统自行式仰拱栈桥结构复杂、操作不灵活、设备技术不成熟、造价高等诸多问题,比较分析国内外高速铁路隧道仰拱栈桥运行方式和优缺点,依托在建的贵南高铁九万大山一号隧道,结合桥跨式和悬挑式2种栈桥的优点进行优化设计,采用配置全弧模板和中心水沟模板的新型自行式液压仰拱栈桥,并采用全弧模板和中心水沟模板一体化设计。实践证明:此新型栈桥操作更安全、更方便,提高了隧道仰拱与中心水沟及仰拱的施工效率,保证仰拱的施工质量,节约成本,减轻劳动强度。

In order to solve the problems for the traditional self-propelled inverted arch trestle in inflexible operation,immature equipment technology and high cost,by comparing and analyzing the operation modes,advantages and disadvantages of inverted arch trestle in high-speed railway tunnel at home and abroad,relying on the Jiuwan Dashan No.1 tunnel of Guinan High-Speed Railway under construction,combined with the advantages of span trestle and cantilever trestle,a new automatic walking hydraulic inverted arch trestle equipped with full arc formwork and central drainage formwork is adopted,and the integrated design of full arc formwork and central drainage formwork is used.Practice has proved that,the new trestle is safer and more convenient to operate,which improves the construction efficiency of tunnel inverted arch,central ditch and inverted arch,and ensures the construction quality of inverted arch,and saves cost and reduces labor intensity.